Sierra Marine Parts Catalog: Mercruiser
Figure
Figure
#
Description
Part #
O.E.M. #
Qty.
#
Description
Part #
O.E.M. #
Qty.
Gearcase 50-75 HP 3 Cyl 1979-2003
43
Screw, Gear Housing to Drive
1
Lower Gear Housing
1623-5356A4
1
Shaft Housing
10-30206
1
2
Water Tube Guide
23-29804
1
44
Nut Gear Housing to Drive
3
Bush Water pump Housing
26-38970
1
Shaft Housing
N/A
11-82671015
2
4
o-ring, Upper - Drive Shaft
25-30613
1
45
Gasket, Gear Housing Drain Screw
12-19183,
5
Slinger
25-30271
1
12-20260
1
6
Stainless Steel Locknuts (5/16-24)
11-45592
1
46
plug, oil Fill/Drain
10-79953A2
1
7
Stainless Steel Locknuts (1/4-28)
11-20361,
47
Insert, Water pick (Stbd)
N/A
66885
1
11-35888
2
48
Insert, Water pick (port)
N/A
66884
1
8
Washer
12-29245
3
49
Screw Insert to Gear Housing
10-76156
1
9
Screw
10-30720
1
50
Nut, Insert Screw
11-45812
1
10
Washer, Water pump Body
12-36001
1
51
Trim Tab
31640A1
1
11
Upper pump Housing
46-96148A1
1
52
Screw, Trim Tab to Gear Housing
10-32470
1
12
Insert Cup
48752
1
53
Needle roller Bearing
31-92366A1
1
13
Impeller
47-89984
1
54
Lower Unit Gear Set (pinion gear)
23-96084A4
1
14
Drive Key
N/A
28-56654
1
55
pinion Nut
11-35921
1
15
Gasket, Upper Water pump to
56
Shift Crank
76865
1
Wear plate (upper)
27-85609-1
1
57
Shift Spool Assembly
19755A2
1
16
Impeller plate
32435
1
58
Shim Kit, Forward Gear Bearing
15-47397A1
1
17
Gasket, Upper Water pump to
59
Tapered roller Bearing
31-35928A1
1
Wear plate (lower)
27-85608-1
1
60
Needle roller Bearing
31-30895
1
18
Dowel pin
17-35973
2
61
Lower Unit Gear Set (Forward)
23-96084A4
1
19
Water pump Base
46-57234A1
1
62
Spring, retainer, Cross pin
24-30893
1
20
oil Seal (upper)
26-16977
1
63
Sliding Clutch
52-66063
1
21
oil Seal (lower)
26-89238
1
64
Cross pin, Clutch to Clutch
22
o-ring (2.175 ID) & (2.1091 ID)
Actuating Shaft
17-30632
1
18-7196
25-90011
1
65
propeller Shaft
44-66060,
23
Gasket, Water pump Base to
44-66060-3
1
Gear Housing
27-85610-1
1
66
Shim Kit, Thrust ring to Gear
24
pin, Driveshaft
N/A
17-30545
1
Housing
15-31535A1
1
25
Spring
N/A
24-34576
1
67
Lower Unit Gear Set (reverse)
43-96084A4
1
26
Tapered roller Bearing
31-53079A1
1
68
Thrust ring, Bearing Carrier
35915
1
27
Shim Kit, Drive Shaft Bearing
15-57007A
1
69
Ball Bearing
30-88957A1
1
28
Drive Shaft
45-41939A1
1
70
o-ring
25-31534
1
29
Shift Shaft Washer
12-29395
1
71
Needle roller Bearing
31-30956
1
30
Washer, rubber Shift Shaft Bushing
12-31266
1
72
Bearing Carrier Assembly
73020A14
1
31
oil Seal
26-89236
1
73
Key, Locating - Bearing Carrier
N/A
28-30281
1
32
Shift Bushing
23-30617A2
1
74
oil Seals
26-76868
2
33
o-ring
25-25439
1
75
Tab Washer
14-79447
1
34
Washer, Lower Shift Shaft Bushing
N/A
12-27880
1
76
Spanner Nut
79448
1
35
retaining Clip, Shift Shaft
53-29641
1
77
Thrust Washer
13171, 77987
1
36
Stainless Steel Shift Shaft
77481-1
1
78
Continuity Washer
NSS
13-423511
1
37
Stud, Gear Housing to Drive
79
Brass Castle Washer
12-31211A2
1
Shaft Housing (1-31/32")
N/A
16-56298
2
80
Tab Washer
14-31210,
38
Stud, Water pump to Gear
14-816629
1
Housing (3 - 3/8")
N/A
16-562972
1
81
prop Nut
11-52707
1
39
Stud, Gear Housing to Drive
Shaft Housing (3 - 3/16")
N/A
16-46911
1
40
Stud, Water pump to Gear
Housing (3 - 1/4")
N/A
16-69501
2
41
oil passage Seal
26-45577
1
42
Dowel pin, Gear Housing to
Drive Shaft Housing
N/A
17-35973
2
Ar
As required
NSS Not Sold Seperate
Ar
705